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Jing, I think the mistake is making the zone unconditioned. You are
trying to keep it under control with ventilation, therefore it is
conditioned, no active heating or cooling but it is conditioned.
You also need the temperature profile of what is going on in that
space so you can understand what is happening. Buildings aren't
always intuitive depending what is going on and where it is
located. You have a fully walled and windowed zone I presume. For
unconditioned I would think a space like a parking garage that is
more than half open on 3 sides.<br>
You also have the impacts of the floor below and the floor above
which probably have larger boundary surfaces with your second floor
space than that space has exterior wall. It may not be energy
efficient to let the second floor stay near exterior temperatures
because of it's impact on the floors above and below. By making it
conditioned and giving it to a system will give you the information
you need to evaluate whether you want to treat it with just
ventilation. Open up your heating and cooling set points so there
really isn't going to be a call for heating and cooling and see what
the temperatures in the space do. Then start tinkering with the
exhaust cfm and zone cooling set point to see if this is practical
from an energy consumption point of view. Also watch what is
happening in the floor above and the floor below. You can advantage
of auto-sizing too.<br>
Bruce Easterbook P.Eng.<br>
Abode Engineering<br>
<br>
<div class="moz-cite-prefix">On 11/15/2017 2:33 PM, Jones,
Christopher via Equest-users wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">SUM
system type. The DOE2.2 manuals do not explain the SUM
system type very well. From the DOE2.1e manual:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">4.
System Descriptions<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">a.
Summation of LOADS to PLANT (SUM)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This
is actually not a secondary HVAC distribution system, but
rather a diagnostic tool, which is used to 1) pass the
hourly LOADS program output to the PLANT program without
simulating a system, 2) adjust the constant zone
temperatures specified in LOADS, 3) simulate the thermostat
schedules (but not the equipment), and 4) tabulate energy
consumption by ZONE (or group of ZONEs). SUM is not a
miscellaneous SYSTEM-TYPE for UNCONDITIONED zones.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">UNCONDITIONEO
ZONEs should be assigned to another SYSTEM.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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style="font-size:6.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:FR"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR"
lang="EN-GB">Christopher R. Jones</span></b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR"
lang="EN-GB">, P.Eng.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR"
lang="EN-GB">Technical Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR"
lang="EN-GB">Sustainability & Energy<o:p></o:p></span></p>
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height="37" width="78"></span><span
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR">T
+1 416-644-0252<o:p></o:p></span></p>
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style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D;mso-fareast-language:FR">2300
Yonge Street, Suite 2300<o:p></o:p></span></p>
<p class="MsoNormal"><span
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ON M4P 1E4 Canada</span><span
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<p class="MsoNormal" style="text-autospace:none"><i><span
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consider the environment before printing...<o:p></o:p></span></i></p>
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<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
Equest-users
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Jing Hong via Equest-users<br>
<b>Sent:</b> Wednesday, November 15, 2017 2:13 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Zones with different HVAC
systems<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Dear All,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I have a building with more than one
kind HVAC system. I have the first floor with VAV system,
and the second floor only has ventilation fans running. So
I made all the zones on Second Floor unconditioned, and
choose SUM as air-side HVAC system for second floor.
However, the Space Cool of no VAV for second floor is even
higher than that of the whole VAV, which does not make
sense to me. <br clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal">Do you know how the eQuest calculate
Space Cool? Should The VAV energy consumption be Space
Cool+Vent. Fans shown on the simulation output?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Jing<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class="MsoNormal">PhD Candidate, LEED AP BD+C<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt">School of
Architecture and Urban Planning</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">University of
Wisconsin-Milwaukee<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
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